#ifndef __TAOLINESEARCH_H
#define __TAOLINESEARCH_H
#include <petscvec.h>

typedef struct _p_TaoLineSearch* TaoLineSearch;
typedef enum {
    TAOLINESEARCH_FAILED_INFORNAN = -1,
    TAOLINESEARCH_FAILED_BADPARAMETER = -2,
    TAOLINESEARCH_FAILED_ASCENT = -3,
    TAOLINESEARCH_CONTINUE_ITERATING = 0,
    TAOLINESEARCH_SUCCESS = 1,
    TAOLINESEARCH_SUCCESS_USER = 2,
    TAOLINESEARCH_HALTED_OTHER = 3,
    TAOLINESEARCH_HALTED_MAXFCN = 4,
    TAOLINESEARCH_HALTED_UPPERBOUND = 5,
    TAOLINESEARCH_HALTED_LOWERBOUND = 6,
    TAOLINESEARCH_HALTED_RTOL = 7,
    TAOLINESEARCH_HALTED_USER = 8
} TaoLineSearchConvergedReason;

#define TaoLineSearchType  char*
#define TAOLINESEARCHUNIT     "unit"
#define TAOLINESEARCHMT       "more-thuente"
#define TAOLINESEARCHGPCG     "gpcg"
#define TAOLINESEARCHARMIJO   "armijo"
#define TAOLINESEARCHOWARMIJO "owarmijo"
#define TAOLINESEARCHIPM      "ipm"

PETSC_EXTERN PetscClassId TAOLINESEARCH_CLASSID;
PETSC_EXTERN PetscFunctionList TaoLineSearchList;

#include <petsctao.h>

PETSC_EXTERN PetscErrorCode TaoLineSearchCreate(MPI_Comm,TaoLineSearch*);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetFromOptions(TaoLineSearch);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetUp(TaoLineSearch);
PETSC_EXTERN PetscErrorCode TaoLineSearchDestroy(TaoLineSearch*);
PETSC_EXTERN PetscErrorCode TaoLineSearchView(TaoLineSearch,PetscViewer);
PETSC_STATIC_INLINE PetscErrorCode TaoLineSearchViewFromOptions(TaoLineSearch A,const char prefix[],const char name[]) {return PetscObjectViewFromOptions((PetscObject)A,prefix,name);}

PETSC_EXTERN PetscErrorCode TaoLineSearchSetOptionsPrefix(TaoLineSearch,const char prefix[]);
PETSC_EXTERN PetscErrorCode TaoLineSearchReset(TaoLineSearch);
PETSC_EXTERN PetscErrorCode TaoLineSearchAppendOptionsPrefix(TaoLineSearch,const char prefix[]);
PETSC_EXTERN PetscErrorCode TaoLineSearchGetOptionsPrefix(TaoLineSearch,const char *prefix[]);
PETSC_EXTERN PetscErrorCode TaoLineSearchApply(TaoLineSearch,Vec,PetscReal *,Vec,Vec, PetscReal *, TaoLineSearchConvergedReason *);
PETSC_EXTERN PetscErrorCode TaoLineSearchGetStepLength(TaoLineSearch, PetscReal*);
PETSC_EXTERN PetscErrorCode TaoLineSearchGetStartingVector(TaoLineSearch,Vec*);
PETSC_EXTERN PetscErrorCode TaoLineSearchGetStepDirection(TaoLineSearch,Vec*);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetInitialStepLength(TaoLineSearch, PetscReal);
PETSC_EXTERN PetscErrorCode TaoLineSearchGetSolution(TaoLineSearch, Vec, PetscReal*, Vec, PetscReal*, TaoLineSearchConvergedReason*);
PETSC_EXTERN PetscErrorCode TaoLineSearchGetFullStepObjective(TaoLineSearch, PetscReal*);
PETSC_EXTERN PetscErrorCode TaoLineSearchGetNumberFunctionEvaluations(TaoLineSearch, PetscInt*, PetscInt*, PetscInt*);

PETSC_EXTERN PetscErrorCode TaoLineSearchGetType(TaoLineSearch, const TaoLineSearchType *);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetType(TaoLineSearch, const TaoLineSearchType);

PETSC_EXTERN PetscErrorCode TaoLineSearchIsUsingTaoRoutines(TaoLineSearch, PetscBool *);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetObjectiveAndGTSRoutine(TaoLineSearch, PetscErrorCode(*)(TaoLineSearch, Vec, Vec, PetscReal*, PetscReal*, void*), void*);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetObjectiveRoutine(TaoLineSearch, PetscErrorCode(*)(TaoLineSearch, Vec, PetscReal*,void*), void*);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetGradientRoutine(TaoLineSearch, PetscErrorCode(*)(TaoLineSearch, Vec, Vec, void*), void*);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetObjectiveAndGradientRoutine(TaoLineSearch, PetscErrorCode(*)(TaoLineSearch, Vec, PetscReal*, Vec, void*), void*);

PETSC_EXTERN PetscErrorCode TaoLineSearchComputeObjective(TaoLineSearch, Vec, PetscReal*);
PETSC_EXTERN PetscErrorCode TaoLineSearchComputeGradient(TaoLineSearch, Vec, Vec);
PETSC_EXTERN PetscErrorCode TaoLineSearchComputeObjectiveAndGradient(TaoLineSearch, Vec, PetscReal*, Vec);
PETSC_EXTERN PetscErrorCode TaoLineSearchComputeObjectiveAndGTS(TaoLineSearch, Vec, PetscReal*, PetscReal*);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetVariableBounds(TaoLineSearch, Vec, Vec);

PETSC_EXTERN PetscErrorCode TaoLineSearchInitializePackage(void);
PETSC_EXTERN PetscErrorCode TaoLineSearchFinalizePackage(void);

PETSC_EXTERN PetscErrorCode TaoLineSearchRegister(const char[], PetscErrorCode (*)(TaoLineSearch));

#endif